The five steps listed below are involved in excitation-contraction coupling

1. A wave of depolarization passes through the T-tubules.
2. Ca2+ binds to and causes a conformational change in troponin.
3. Tropomyosin moves to expose myosin-binding sites on the actin.
4. Ca2+ is released from the sarcoplasmic reticulum.
5. Cross-bridges form and produce a contraction.
Which of the following lists the steps in the correct order of events?
A. 1, 4, 2, 3, 5
B. 4, 5, 2, 1, 3
C. 1, 2, 4, 3, 5
D. 5, 4, 1, 2, 3
E. 2, 1, 3, 5, 4


A

Biology & Microbiology

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